1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.fcgi.parser;
20
21 import java.nio.ByteBuffer;
22
23 import org.eclipse.jetty.fcgi.FCGI;
24
25 /**
26 * <p>Parser for the BEGIN_REQUEST frame body.</p>
27 * <pre>
28 * struct begin_request_body {
29 * ushort role;
30 * ubyte flags;
31 * ubyte[5] reserved;
32 * }
33 * </pre>
34 */
35 public class BeginRequestContentParser extends ContentParser
36 {
37 private final ServerParser.Listener listener;
38 private State state = State.ROLE;
39 private int cursor;
40 private int role;
41 private int flags;
42
43 public BeginRequestContentParser(HeaderParser headerParser, ServerParser.Listener listener)
44 {
45 super(headerParser);
46 this.listener = listener;
47 }
48
49 @Override
50 public Result parse(ByteBuffer buffer)
51 {
52 while (buffer.hasRemaining())
53 {
54 switch (state)
55 {
56 case ROLE:
57 {
58 if (buffer.remaining() >= 2)
59 {
60 role = buffer.getShort();
61 state = State.FLAGS;
62 }
63 else
64 {
65 state = State.ROLE_BYTES;
66 cursor = 0;
67 }
68 break;
69 }
70 case ROLE_BYTES:
71 {
72 int halfShort = buffer.get() & 0xFF;
73 role = (role << 8) + halfShort;
74 if (++cursor == 2)
75 state = State.FLAGS;
76 break;
77 }
78 case FLAGS:
79 {
80 flags = buffer.get() & 0xFF;
81 state = State.RESERVED;
82 break;
83 }
84 case RESERVED:
85 {
86 if (buffer.remaining() >= 5)
87 {
88 buffer.position(buffer.position() + 5);
89 onStart();
90 reset();
91 return Result.COMPLETE;
92 }
93 else
94 {
95 state = State.RESERVED_BYTES;
96 cursor = 0;
97 break;
98 }
99 }
100 case RESERVED_BYTES:
101 {
102 buffer.get();
103 if (++cursor == 5)
104 {
105 onStart();
106 reset();
107 return Result.COMPLETE;
108 }
109 break;
110 }
111 default:
112 {
113 throw new IllegalStateException();
114 }
115 }
116 }
117 return Result.PENDING;
118 }
119
120 private void onStart()
121 {
122 listener.onStart(getRequest(), FCGI.Role.from(role), flags);
123 }
124
125 private void reset()
126 {
127 state = State.ROLE;
128 cursor = 0;
129 role = 0;
130 flags = 0;
131 }
132
133 private enum State
134 {
135 ROLE, ROLE_BYTES, FLAGS, RESERVED, RESERVED_BYTES
136 }
137 }